基于互相关定位法的干涉仪分析与仿真

首次提出用时域互相关法处理Sagnac/Mach-Zehnder分布式光纤传感系统的干涉输出信号, 对扰动进行检测和定位。首先对Sagnac/Mach-Zehnder分布式光纤传感系统进行了扰动检测和定位的理论分析, 推导出扰动引起的干涉输出信号的表达式, 利用Bessel函数展开, 确定了该系统的两路干涉输出满足时域互相关的特性。在此基础上进一步分析了两路干涉信号的表达式, 提出基频定位法和微分定位法两种时域互相关方法处理干涉信号, 确定扰动位置。对两种扰动定位方法进行了Matlab仿真, 并通过实验在多个扰动位置多次验证了两种方法的正确性。

Research of Interferometer Based on Cross-correlation Location Method Computer Engineering and Applications

This paper proposes to process the interference outputs of the Sagnac/Mach-Zehnder interferometer by using time-domain cross-correlation method, which is a distributed optical fiber sensing system, to detect and locate the disturbance. Firstly, it gives the theoretical analysis of Sagnac/Mach-Zehnder interferometer, derives the expression for the interference outputs and uses Bessel function to expanse the expression, demonstrates the two interference outputs of the system meet the time-domain cross-correlation properties. Based on further analysis of the expression of two interference signals, it proposes two time-domain cross-correlation method by the baseband positioning method and differential positioning method to approach the interference signal to determine the disturbance location.